Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 40: Perovskite and Hybrid Photovolatics I (joint session HL/CPP)

HL 40.9: Vortrag

Donnerstag, 4. April 2019, 11:45–12:00, H36

Identifying recombination dynamics in efficient perovskite solar cells with transient optoelectrical techniques via active layer thickness alteration — •David Kiermasch¹, Lidón Gil-Escrig^2,3, Andreas Baumann⁴, Henk J. Bolink², Kristofer Tvingstedt¹, and Vladimir Dyakonov¹ — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Instituto de Ciencia Molecular, Universidad de Valencia, 46980, Paterna, Spain — ³Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin — ⁴Bavarian Center for Applied Energy Research (ZAE Bayern) Bayern, 97074 Würzburg

Quantifying charge carrier recombination processes leading to energy losses in perovskite solar cells is of crucial importance for further improvements. Usually time-resolved photoluminescence (PL) is used to study charge carrier recombination, since electrical techniques are often limited by large capacitance values due to thin film layers and mostly short charge carrier lifetimes. By optimizing both the active layer thickness and the surrounding transport layers, we identified bulk dynamics using the combination of Transient Photovoltage (TPV) and Charge Extraction (CE) in MAPbI₃ solar cells with V_oc’s above 1.1 V and efficiencies up to 18 %. This allows us to assign loss processes to be mainly of Shockley-Read-Hall and free-carrier recombination type in line with PL studies on pure films. Our work also shows that increasing the perovskite thickness, advantageous to achieve high photocurrents, does not affect the recombination dynamics significantly confirming the high quality of the vacuum processed solar cells studied herein.